The identification method of blade material parameters and dynamic response analysis of impact

Abstract

Caused by the foreign object damage (FOD), failure usually occurs within a very short time so there are many uncertainties about it and it is difficult for experimental instruments to monitor their dynamic response. Therefore, the dynamic response of the impact must be analysed by means of numerical simulation. But, there is a severe lack of the dynamic mechanical performance parameters of the structural materials involved. In this research, the first-class fan titanium alloy blade of a turbofan engine was used as a specimen to carry out the FOD test. The test results show that the crack damage has obvious morphological characteristics and narrow parameter range. Based on the results of the FOD test, the reverse identification of Johnson-Cook model parameters is used and the finite element model of the foreign object impacting blade is constructed. Finally, the dynamic response of the impact is analysed from the perspective of different strengths applied and contact forces, which further proves the scientific and engineering value of the model.